======================== unified (from filesystem) ========================
                                         'bitrate'  '320.0'
                                        'duration'  '137'
                                          'artist'  'Guy Mitchell'
                                     'text_people'  ''
                                         'release'  'Heartaches by The Number'
                                           'title'  "(Can't Get Enough Of That) Sweet Stuff"
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-LOCALNESS-3', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-1', 'q-busy-2', 'q-grit-1', 'q-play-2', "
 "'q-chart-1', 'q-drums-1', 'q-other-3', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['country', 'pop', '50s', 'oldies', 'rock n roll']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '424'
                                      'tracktotal'  ''
                                            'date'  '1957'
                                        'comments'  ''
                                           'genre'  'prerock-country'
                                             'bpm'  '137.385'
                                             'key'  '6A'
                                        'acoustid'  ''
rest: ''

======================== rawer (from filesystem) ========================

'TALB' (Album/Movie/Show title)                     'Heartaches by The Number'
'TBPM' (BPM (beats per minute))                     '137.385'
'TCON' (Content type, a.k.a. Genre)                 'prerock-country'
'TDRC' (Recording time)                             '1957'
'TIT2' (Title/songname/content description)         "(Can't Get Enough Of That) Sweet Stuff"
'TKEY' (Initial key)                                '6A'
'TPE1' (Lead performer(s)/Soloist(s))               'Guy Mitchell'
'TRCK' (Track number/Position in set)               '424'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '3'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['country', 'pop', '50s', 'oldies', 'rock n roll']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '1'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '1'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+0.40 dB'
'TXXX:replaygain_track_peak'                        '0.622348'

========================== row from database ==========================
                                              'id'  1513999
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1957/57-424 - Guy Mitchell - (Can_t Get Enough Of That) Sweet Stuff.mp3
                                         'working'  None
                                         'bitrate'  320
                                    'duration_sec'  137
                                           'genre'  prerock-country
                                        'filesize'  5522201
                                           'mtime'  1621627905
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop 1957 57 424 (Can_t prerock country
                                      'tag_artist'  Guy Mitchell
                                     'tag_release'  Heartaches by The Number
                                       'tag_title'  (Can't Get Enough Of That) Sweet Stuff
                                             'bpm'  137.385
                                    'search_title'  'can':1 'cant':3 'enough':5 'get':4 'of':6 'stuff':10 'sweet':9 't':2 'that':7,8
                                   'search_artist'  'guy':1 'mitchell':2
                                  'search_release'  'by':2 'heartaches':1 'number':4 'the':3
                                     'search_rest'  '00oldiepop':5 '1957':6 '424':8 '57':7 'can':9,11 'country':4 'exotica':2 'jazz':1 'oldies':3 'prerock':13 't':10,12
                                    'search_combo'  '00oldiepop':21 '1957':22 '424':24 '57':23 'by':14C 'can':1A,25,27 'cant':3A 'country':20 'enough':5A 'exotica':18 'get':4A 'guy':11B 'heartaches':13C 'jazz':17 'mitchell':12B 'number':16C 'of':6A 'oldies':19 'prerock':29 'stuff':10A 'sweet':9A 't':2A,26,28 'that':7A,8A 'the':15C
                                    'tag_tracknum'  424
                                      'num_images'  0
                                             'key'  6A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-3', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-1', 'q-other-3', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['country', 'pop', '50s', 'oldies', 'rock n roll']
                                        'tag_date'  1957
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621627904.9136627  (2021-05-21 22:11:44)
                             'size'  5522201